WHAT IS THE ENGINE OIL CLEARANCE OF THE CONNECTING ROD BEARING AND ITS CAP BOLT.NIT TIGHTENING TORQUE?

1987 Mercedes Benz 260e

Tiny

edgyona10

September, 14, 2011 AT 9:35 AM

The connecting rod bearings are due for replacement

10 Answers

Tiny

Jacobandnickolas

September, 14, 2011 AT 4:49 PM

The bearings shouldn't need replaced at 33K miles. Are you getting a knocking from the engine? Has the oil been changed on a regular basis?

Tiny

edgyona10

September, 15, 2011 AT 5:09 AM

The engine oil pressure was such too low. Zero reading as engine warms up. An oil change is not followed at its regular changing intervals.

Tiny

Jacobandnickolas

September, 16, 2011 AT 12:15 AM

Can you hear the rod bearings knocking? My concern is that it may just be a bad oil sending unit. You may want to check oil pressure with a mechanical gauge to confirm the pressure is very low. As far as clearance between the bearings and crank, you are looking at thousands of an inch. You need plasta-gauge to check if they are bad.

Tiny

edgyona10

September, 16, 2011 AT 4:32 AM

There's no knocking noise whatsoever. Since we've got to change the conrod bearing, we will be using plasti-gauge to initially check the clearances. May we please know the oil clearance tolerance and the tightening torque of the conrod bolts. Thanks.

Tiny

edgyona10

September, 16, 2011 AT 4:42 AM

By the way, what is the specific lenght measurement of the oil pump relief valve spring. Sorry for the mis typing of mileage run, it should be 68,912.

Tiny

Jacobandnickolas

September, 16, 2011 AT 5:07 AM

Connecting rod journals diameter 1.8880 - 1.8884 inches or 47.955 - 47.965mm

Torque: Step 1. 22 ft lbs
Step 2. Angle tighten 90 degrees

I don't have the length of the relief spring. All I can find on that is it is set to release at 71 psi

Tiny

edgyona10

September, 16, 2011 AT 2:21 PM

Thanks for the info, it will best serve us if the measurement has to be taken on the flattened plasti-gauge rather than taking the difference between the diameter of the big end bore against the diameter of the crankpin journal. I reasoned out that I dont have caliper and bore measuring tools. May I please know the oil clearance dara, your help is so much appreciated. Thanks.

Tiny

Jacobandnickolas

September, 17, 2011 AT 2:56 AM

Oil clearance? I'm not sure I understand.

Tiny

edgyona10

September, 17, 2011 AT 6:49 AM

Means the required clearance between the connecting rod bearing and its corresponding crankpin journal.

Tiny

Jacobandnickolas

September, 17, 2011 AT 6:13 PM

That would be the tolerance of the bearing. It should be.010

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